iOS动画和特效（三）MotionEffects

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核心原理

UIInterpolatingMotionEffect 是 UIMotionEffect的一个子类，是具体的实现类，实现设备水平角度变化对UI元素的属性

    UIImageView *imView =[UIImageView new];    imView.frame = CGRectMake(100, 100, 200, 200);    imView.image = [UIImage imageNamed:@"1"];    [self.view addSubview:imView];        UIInterpolatingMotionEffect *xeffect  =[[UIInterpolatingMotionEffect alloc]initWithKeyPath:@"center.x" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];    xeffect.minimumRelativeValue = [NSNumber numberWithDouble:10.0];    xeffect.maximumRelativeValue = [NSNumber numberWithDouble:50.0];;        UIInterpolatingMotionEffect *yeffect = [[UIInterpolatingMotionEffect alloc]initWithKeyPath:@"center.y" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];    yeffect.minimumRelativeValue = [NSNumber numberWithDouble:10.0];    yeffect.maximumRelativeValue = [NSNumber numberWithDouble:80.0];        UIMotionEffectGroup *ffectGroup = [[UIMotionEffectGroup alloc]init];        ffectGroup.motionEffects = @[xeffect,yeffect];        [imView addMotionEffect:ffectGroup];

ui元素绑定效果后，设备水平角度改变，就会对应修改keyPath的value，这里指定的keyPath是中心坐标的x位置，所以会水平移动。

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